Fixed Inductors

Part Number	Description / PDF	Quantity
LQH2MPN220MGRL TOKO / Murata	FIXED IND 22UH 290MA 2.52 OHM	0
LQW2UASR22J00L TOKO / Murata	FIXED IND 220NH 500MA 840 MOHM	1415
LQW15AN8N0J80D TOKO / Murata	FIXED IND 8NH 1.7A 50 MOHM SMD	0
LQG15WHR12H02D TOKO / Murata	FIXED IND 120NH 140MA 2.7 OHM	0
LQW2UAS2R2J0CL TOKO / Murata	FIXED IND 2.2UH 280MA 2.8 OHM	1837
LQG15HS6N2S02D TOKO / Murata	FIXED IND 6.2NH 600MA 220 MOHM	37884
LQG15HZR22H02D TOKO / Murata	FIXED IND 220NH 120MA 3.77 OHM	13330
DD1217AS-H-1R5N=P3 TOKO / Murata	FIXED IND 1.5UH 9.4A 7.6 MOHM	5231
LQW03AW4N3J00D TOKO / Murata	FIXED IND 4.3NH 480MA 120 MOHM	3245
LQM18NN2R2K00D TOKO / Murata	FIXED IND 2.2UH 15MA 1.15 OHM	13971
LQW2BHN8N2D03L TOKO / Murata	FIXED IND 8.2NH 630MA 120 MOHM	250
LQH32NZ180J23L TOKO / Murata	FIXED IND 18UH 165MA 2.5 OHM SMD	1990
LQG15HS12NG02D TOKO / Murata	FIXED INDUCTOR 12NH 0402	10000
LQW15CAR11J00D TOKO / Murata	FIXED IND 110NH 900MA 130 MOHM	11580
DFE252012PD-1R0M=P2 TOKO / Murata	FIXED IND 1UH 3.2A 42 MOHM SMD	14500
LQG15WHR13H02D TOKO / Murata	FIXED IND 130NH 110MA 2.9 OHM	0
LQW18AN69NJ80D TOKO / Murata	FIXED IND 69NH 630MA 380 MOHM	0
DFE201610E-2R2M=P2 TOKO / Murata	FIXED IND 2.2UH 1.7A 140 MOHM	0
LQW31HN23NJ03L TOKO / Murata	FIXED IND 23NH 590MA 46 MOHM SMD	1635
LQP15MN3N2W02D TOKO / Murata	FIXED IND 3.2NH 190MA 400 MOHM	0

Fixed Inductors

1. Overview

Fixed inductors are passive electronic components designed to store energy in magnetic fields when electrical current flows through them. Unlike variable inductors, their inductance values remain constant during operation. These components play critical roles in filtering, signal processing, energy storage, and electromagnetic interference (EMI) suppression across modern electronics, including power supplies, communication systems, and automotive electronics.

2. Main Types and Functional Classification

Type	Functional Characteristics	Application Examples
Wirewound Inductors	High precision, high current handling, low resistance	Power supplies, DC-DC converters
Chip Inductors	Compact SMD package, stable performance at high frequencies	Mobile devices, RF circuits
Ferrite Bead Inductors	Effective high-frequency noise suppression	EMI filtering in digital circuits
Thin-Film Inductors	Ultra-compact, high Q-factor, tight tolerance	5G communication modules, IoT devices

3. Structure and Composition

Typical fixed inductors consist of:

Magnetic Core: Made from ferrite, powdered iron, or composite materials to concentrate magnetic flux
Coil Structure: Copper wire wound around the core (enamelled or silver-plated)
Encapsulation: Molded resin or ceramic coating for mechanical protection and insulation
Terminations: Solder-coated ends for PCB mounting (for SMD types) or leaded connections

4. Key Technical Specifications

Parameter	Description	Importance
Inductance (L)	Measured in henrys (H), determines energy storage capacity	Defines filtering/energy storage performance
Rated Current (I_rated)	Maximum DC current before saturation	Prevents core saturation and failure
DC Resistance (DCR)	Resistance of coil windings	Affects efficiency and thermal performance
Self-Resonant Frequency (SRF)	Frequency where inductor behaves as capacitor	Limits effective operating frequency range
Q Factor	Quality factor indicating efficiency	Higher Q = lower energy losses

5. Application Fields

Consumer Electronics: Smartphones, laptops, LED drivers
Industrial Equipment: Motor drives, power inverters
Automotive Systems: ECU modules, EV battery management
Telecom Infrastructure: Base station filters, optical transceivers

6. Leading Manufacturers and Products

Manufacturer	Representative Product	Key Features
Murata	LQH3NPN100M	10 H, 1.2A, 1.8 1.4mm chip inductor
TDK	MLZ2012A100T	100MHz SRF, 1.0 1.25mm for RF circuits
Vishay	IHLP2525CZER1R0M	1 H, 12A, composite construction
Coilcraft	0402DC-103J	10 H, 5% tolerance, ultra-low profile

7. Selection Guidelines

Key considerations during selection:

Calculate required inductance based on switching frequency and ripple current
Verify rated current exceeds maximum operating current by 20-30%
Select SRF higher than circuit operating frequency
Consider package size vs. thermal dissipation requirements
For EMI suppression: Choose ferrite beads with impedance curves matching target frequencies

8. Industry Trends

Current development trends include:

Miniaturization: Sub-0.5mm size inductors for wearable devices
High-Frequency Operation: Components supporting >10GHz 5G applications
Integrated Solutions: Combined inductor-filter modules
Material Innovation: Nanocrystalline cores for higher saturation flux
Automotive Focus: AEC-Q qualified parts for EV/HEV systems